get

For a given class, find the SSO for the class, creating it if necessary. The manager has a configuration that
determines how an instance is stored and created as needed. The default (when there is no configuration for
a SSO type) is to instantiate the object with injected dependencies, via ObjectLocator.autobuild(Class).
This
allows an SSO to keep references to Tapestry IoC services or other objects that can be injected.